Additive vs. dominance two-allele genetic model by DIC

Two-allele model has alleles A1 and A2 and genotypes A1A1, A1A2, and A2A2. This model can be fitted using only additive effect (restricted model) or additve+dominance effect. (full model) The later model has one parameter more than the former. I was using this model lately and got weird DIC results – the full model had less number of parameters. Bellow is a simulation (using R and BUGS), that shows expected DIC results.